Title :
Gamma radiation nose system based on In2O3/SiO thick-film sensors
Author :
Arshak, Khalil I. ; Korostynska, Olga
Author_Institution :
Electron. & Comput. Eng. Dept., Univ. of Limerick, Ireland
fDate :
4/1/2006 12:00:00 AM
Abstract :
A prototype gamma radiation monitoring system based on In2O3/SiO thick-film sensors array was designed. Four sensors had an identical pn-heterojunction structure with different material compositions. These sensors were subjected to gamma radiation emitted by 137Cs source with an activity of 370 kBq. Changes in their current-voltage characteristics were recorded and compared. The performance parameters of the devices, such as sensitivity to γ radiation exposure and working dose region, were found to be highly dependent on the composition of the materials used. To cover a wider range of radiation and improve the overall sensitivity, an approach of using sensor arrays was utilized. A dynamic selection of the multiple sensors of various sensitivities and working dose ranges was implemented by applying a pattern recognition analysis.
Keywords :
electric sensing devices; gamma-ray detection; p-n heterojunctions; radiation monitoring; radioactivity measurement; thick film devices; Cs; In2O3-SiO; current-voltage characteristics; gamma radiation emission; gamma radiation monitoring system; gamma radiation nose system; pattern recognition analysis; pn-heterojunction structure; thick-film sensors; Composite materials; Gamma ray detectors; Gamma rays; Nose; Prototypes; Radiation monitoring; Sensor arrays; Sensor phenomena and characterization; Sensor systems; Thick film sensors; Metal oxides; pattern recognition (PR); sensor arrays; thick films;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2005.860315
